If you want some more implicits to be visible by RPC macros, make the companion of your raw RPC trait
extend RpcImplicitsProvider (e.g.

If you want some more implicits to be visible by RPC macros, make the companion of your raw RPC trait
extend RpcImplicitsProvider (e.g. through RpcMetadataCompanion), override this val with an object
and put your additional implicits into it.